package com.example.util;

import java.io.IOException;   

import javax.servlet.Filter;   
import javax.servlet.FilterChain;   
import javax.servlet.FilterConfig;   
import javax.servlet.ServletException;   
import javax.servlet.ServletRequest;   
import javax.servlet.ServletResponse;   
   
public class SetCharacterEncodingFilter implements Filter {   
	protected String encoding = null;   
	   
	protected FilterConfig filterConfig = null;   
	   
	protected boolean ignore = true;   
   
 
	public void destroy() {
		this.encoding = null;   
		this.filterConfig = null;   
	   
	}
   
	 public void doFilter(ServletRequest request, ServletResponse response,   
							FilterChain chain) throws IOException, ServletException {   
	   
		 if (ignore || (request.getCharacterEncoding() == null)) {   
			 String encoding = selectEncoding(request);
			 if (encoding != null) {   
				 request.setCharacterEncoding(encoding);   
			 }   
		 }   
		 // Pass control on to the next filter   
		 chain.doFilter(request, response);   
	 }   
	 
	public void init(FilterConfig filterConfig) throws ServletException {   
		  this.filterConfig = filterConfig;   
		  this.encoding = filterConfig.getInitParameter("encoding");   
		  String value = filterConfig.getInitParameter("ignore");   
		  if (value == null) {   
		   this.ignore = true;   
		  } else if (value.equalsIgnoreCase("true")) {   
		   this.ignore = true;   
		  } else if (value.equalsIgnoreCase("yes")) {   
		   this.ignore = true;   
		  } else {   
		   this.ignore = false;   
		  }   
	}   

	 protected String selectEncoding(ServletRequest request) {   
		return (this.encoding);   
	 }   
} 
